| first-element :before < abstract-queue > |
| first-element < ARRAY > |
| first-element < basic-queue > |
| first-element < binary-search-tree > |
| first-element < bst-node > |
| first-element < dlist-container > |
| first-element < iteratable-container-mixin > |
| first-element < LIST > |
| first-element < list-container > |
| first-element < priority-queue-on-container > |
| first-element < ring-buffer > |
| first-element < sorted-list-container > |
| first-element < stack-container > |
| first-element < VECTOR > |
| first-element < vector-container-mixin > |